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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, Gross Carrying Value     $ 9,940.2 $ 9,871.8
Goodwill, Accumulated Amortization     (519.9) (534.3)
Goodwill, Net Carrying Value $ 9,337.5 $ 8,976.1 9,420.3 9,337.5
Intangible assets:        
Intangible assets:, Gross Carrying Value     1,117.8 1,248.3
Intangible assets:, Accumulated Amortization     (730.1) (879.9)
Intangible assets:, Net Carrying Value     387.7 368.4
Changes in Goodwill        
Goodwill, January 1 9,337.5 8,976.1    
Goodwill, Acquisitions 232.5 18.9    
Goodwill, Noncontrolling interests in acquired businesses 111.7 20.3    
Goodwill, Contingent purchase price of acquired businesses 60.2 26.9    
Goodwill, Written off Related to Sale of Business Unit (141.9) 0.0    
Goodwill, Foreign currency translation 179.7 (280.8)    
Goodwill, September 30 $ 9,420.3 $ 9,323.0    
Purchased and internally developed software        
Intangible assets:        
Intangible assets:, Gross Carrying Value     354.9 368.2
Intangible assets:, Accumulated Amortization     (304.4) (303.0)
Intangible assets:, Net Carrying Value     50.5 65.2
Customer related and other        
Intangible assets:        
Intangible assets:, Gross Carrying Value     762.9 880.1
Intangible assets:, Accumulated Amortization     (425.7) (576.9)
Intangible assets:, Net Carrying Value     $ 337.2 $ 303.2